physical education. n. (Education) training and practice in sports, gymnastics, etc, as in schools and colleges. Abbreviation: PE. physâ²ical educaâ²tion. n. instruction in sports, exercise, and hygiene, esp. as part of a school or college program.
3. Stress/injury. Stress on the tissues or any type of injury in the mouth can cause canker sores. Since the sores are actually tiny ulcers, they can be caused by any kind of hard brushing or eating something that can cause bruises or lead to tissue inflammation in the mouth.
WebMD explains that stomatitis occurs inside any part of the mouth including the cheeks, gums, tongue, lips and palate. Mouth ulcers or aphthous ulcers, herpetic sores and mouth irritation usually cause stomatitis. In addition to gum disease, stomatitis from mouth irritation often stems from biting the cheek, tongue or lip.